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How are invisible planes not completely black inside? No light is reaching them.

They have light sources on the inside of the plane, like lamps and stuff.

Good point... You can't see anything outside the plane though, no?

i imagine that either the magic that provides the plane this ability can magically duplicate the light, or the sufficiently advanced technology also has cameras to view the light and a way to mimic it on the interior of the plane

Surely (I am not a physicist) one kind of an invisible plane Would be one where all the light that hits it is absorbed - comes into it but does not Reflect off - so the light would be incredibly bright inside.

Or would that be just a hole in the sky?

I mean that would be a radar invisible plane. Would the scattering of the light around the rest of the sky be enough to occlude your “hole” ?

That's a black hole, yep.

A black hole absorbs the light via gravity. Theoretically, couldn't we have a surface so black that nothing reflected?

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